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luminous efficiency function

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luminous efficiency function (In French courbe d’efficacité lumineuse) describes the spectral luminous efficiency of the human eye in daylight for the 2° standard observer. The maximum in green is 555 nanometers. The luminous efficiency function also explains why human beings can distinguish more green color shades than red or blue, why “green” is good for the eyes and why green coats are usually worn in the operating theater.